Figure 1From: Effect of all-trans retinoic acid on the proliferation and differentiation of brain tumor stem cellsBTS resulting from the proliferation of a single BTSC(Inverted phase-contrast microscope, × 400). 1A:an hour after inoculated. 1B: 12 hours after inoculated. 1C: 24 hours after inoculated. 1D: 3 days hours after inoculated.Back to article page